Vehicle-tire.



UNITED STATES PATENT lioEEIcE.

JAMES CHRISTY', OIF AKRON, OHIO.

VEHICLE-TIRE.

Speciication of Letters Patent.

Application led lay 13, 1912. Serial No. 886,863.

To all 'whom it may concern.' Beit known that I, JAMES CHRISTY, citizen of the United lStates, residing at Akron, in the county of Summit and State of Ohio, have invented certain new and useful Imrovementsin Vehicle-Tires, of which the I ollowing is aspeciication.

` This invention relates to resilient vehicle tires, and the invention consists 1n an improvement in what are commonly known as solid rubber tires,and in this instance in a tire of the double tread variety, all substantially as shown and described and par- Y ticularly pointed out in the claim.

In the accompanyin drawings, Figure 1 is a perspective view o a section of one form of tire embodying my invention, and Fig. 2 is a side elevation of a section of said tire shown as under a load. Fig. 3 is a perspective view of a section of a modification of the tire shown in Fig. 1.

l As thus shown the invention is comprised in av tire made exclusively of rubber of a' suitable consistency and quality to withstand the-heavy wear for which it is intended, such as is sustained by trucks, traction engines and the like .on city streets, and to this end the present tire is made with two or double treads a, which are spaced apart or separated in the periphery by ya substantially V-shaped channel or groove while the sides of the tire have a substantially panel shape, thel walls thereof being straight radially and the treads a overhanging said sides or vextending laterally beyond the samesomewhat in their outer portion. This construction alone is designed to contribute measurably to the resiliency of the tire, but the total resilient effect is obtained only by supplementing the said treads withrecesses or cavities 2 formed in both sides of the tire substantially as shown. The said recesses are square or rectangular in outline but'of parallel treads spaced by a channel as shown so as to make each tire distinctive and in a measure independent of the other structur# ally will throw considerable portionsof the... load laterally over the said recesses, and here' Patented July 15, 19,13. Y

it is-taken care of by the stock 3 which un-" der a load will be compressed more or less and be accommodated by the shock absorbin recesses as seen, for example, in Fig. 2. O course if the load were very heavy the said recesses might be much more nearly closed Vthan -this view shows but the cushion or resiliency which. they aii'ord would remain.

It will also be seen that the stock or wall between the sides and. ends of said recesses is uniform throughout the tire, and however viewed the same amount and form of `the standin rubber is present with each recess,

the rub er between theends of recesses inV the same series comin y'directly opposite the 'middle of one of the s ots in the next series.

Furthermore, and in addition to staggering the said recesses, they are shownas being overlapped at both ends approximately onefourth their length by the recesses of the other series. 'This contributes-most eifectually to resillentaction under the load and also absorbs a shock or impact that comes from obstructions in the road.

In Fig. 2the tire is shown ashaving transverse ribs 4 oneach treadadapted to prevent skidding, and to promote traction, but otherwiseit is the same as Fig. 1, that is, it has the same staggered radialribs 3 and intermediate annularwall 5.

It will be further noticed asa feature of construction that-the depth of the material between slots is substantially equal to the radial depth ofthe recesses, which in any orf' vdinary all rubber tire is about the right proportion. .-^O-f course, something will depend onthe quantity of the stock used.

The base`6 of the tire is common to both treads, and may of course be reinforced with anchoring wires transfixed therein or even a tie in the channel betweenv the treads if pre.

ferred. I might also make another series of recesses in each sidev of the tire but in that case either'the recesses would have to be made of less radial depth or the depth of the tire increased.

In saying that the respective -recesses 'on each side overlap at their ends it will of course be understood that a relative overlapping ismeant as the wall .3 of the stock necessarily intervenes, and in avery real Sense a honeycombed or cellular side wall is thus produced "having sustainl-A wvallsybetween the cells very mueh'like t e 4walls in A tbe,hone comb Valthough the cells VareA 'obo' lo in e evaton.

at I claim is: v v A resilient. tire with a solid rubber core and vtwo treads about` the same s aced apart b ya relativel small substantial y V-shaed c annel and Aavn .recessed flat sides between the said trea s and the base of the tire equal substantially vtoene-third the radial vdepth of the. tireA and Ysaid sides provided "with two concentric series of substantially rectangular we. enetrating to substantially midway thev ateral depthv of each tread; said 4recesses being, spaced apartinmeans adapted each side beneath the said treads in the r1d-' infr movements of tv he tire in either direction. n testimony `whereof allx my signature 111 the presence of two wltnesses.

JAMES CHRISTY."

- Witnesses:

E. M. Flam-1R, T. FISHER.

Copies of this patent may be obtained for ine cents each, by addressing the commissioner of Patents.

- 1 v Washington, D. C.

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